It is not uncommon to have problems with regular bowel movements after procedure like appendectomy.
The combination of anesthesia and pain medication can cause severe constipation for up to a week.
This can be treated with Metamucil each day, plus Milk of Magnesia if needed.
Still, failure to have a bowel movement after two days or longer must be reported to your surgeon.
In some cases, constipation along with abdominal pains in form of cramps, abdominal swelling, nausea and vomiting should raise suspicious about bowel obstruction, which is one of the complications of this surgery.
If your surgeon exclude bowel obstruction like possible problem, she/he will suggest you how to treat constipation with laxatives.
Don't take laxatives on your own!